Funnel for filling liquids into PET bottles

My mother needs a funnel to fill kefir into pet bottles. 

She said: It is important that the funnel is not made of metal, that harms the kefir. 

Ok I just believe that now and what would I be for a 3d maker (and son) if I had not immediately implemented? ;)
 

Maybe the design fits or pleases you too. The funnel has a vent for faster filling. 

I printed the funnel in reverse (opening down). Supports are necessary because of the handle
 

Have fun printing.